US 352809 A
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"UNITED STATES PATENT Ursula.
SAMUEL GLELAND DAVIDSON, OEBELFAST, IRELAND.
PROCESS OF CLARIFYING TEA.
,SPECIPICATION forming part of Letters Patent No. 352:809, dated November 16, 1886.
Application filed February 25, 1886.
.To aZZ whom it may concern.-
Be it known that I, SAMUEL CLELA-ND DA- VIDSON, of Belfast, Ireland, have invented certainne'w and useful Improvements inthe Clarification of Aqueous-In fusions or Decoctions of Tea, of which the following is a specification.
,When aqueous infusions or decoctions of tea as ordinarily prepared become cold, they are usually very turbid and objectionable-looking as beverages, and in thisstate are also very prone to decomposition ii kept for even a few days. This turbid precipitation is due to the chemical reaction incooling of the constituent ingredients of the infusion upon one another, and anyproc'ess of clarification which involves the removal of these precipitated'matters necessarilyinvolves an equivalent loss of the very ingredients which give strength and quality to the liquor.
My hereinafterdescribed improvements in the clarification of such infusions have the great advantage of not involving the removal I of this precipitated matter, their principle of operation being to dissolve it and hold the con turbid,owing to the formation of the precipitatehereinbefore described. To this opaquelooking liquor I now add borax (biborate of soda) in sufiicient quantity to dissolve the precipitated matter,about two grains of borax to each ounce of infusion being generally sufficlent to thoroughly clarify the liquor,which it at the same time renders slightly alkaline to test-paper. and capable of being kept a long time in good It also makes it richer in color I condition if bottled carefully, so as to exclude air, or'it maybe mixed with carbonated water and bottled to form aerated beverages. When Serial No. 193,211. (No specimens.)
required for this latter purpose, the borax treatthis purpose the trihydrate of alumina which I preferably employ is that described in my Patent No.243,521viz., that prepared by precipitation from alum,the precipitate being well washed and filtered and then mixed with water into apaste of cream-like consistency. Of this alumina paste I use about one gallon to every twenty gallons of infusion, and after stlrring it well into the hot infusion I filter it out again by passing the infusion through bag or other suitable filters. The alumina combines with and carries out with it the matter which the carbonic acid would subsequently precipitate, and I preferably filter out the alumina while the infusion, is still hot. Thefiltered infusion in cooling will become almost as turbid sweet, sugar may be added to the clarified liq-.
uors to whatever degree of sweetness may be desired; but the sugar used should be of the purest quality. v
In the preparation of the infusions the water which I preferably use is what is known as soft waterthat is, water free from the hardness of sulphate of lime in solution.
I am aware that borax has long been known and used as apreservative for milk, meat,'fish, 85c. but, so far as I am aware, it has never been used for effecting the clarification of the substances with which it is mixed. For extmple, its effect on milk has never been to :larify it. I makeno claim to the use of borax IS a preservative.
I am also aware that alum and borax have Jeen used together for preserving meat, milk, 8m; butI do not use alum at all. It would lot answer the purpose of my invention, as its affect on a decoction of tea is not to clarifyit, )ut, on the contrary,to render'it much more tur- Jid. I use another compound of aluminium' viz., trihydrate of alumina, and this only when ;he decoction is to be mixed with carbonic acid )r carbonated water.
I am also aware that alum and borax have seen used conj ointly for purifying river-water; out when so used the impurities of the water 1.16 precipitated not by theborax but by the ac- ;ion of the alum, and this action takes place if 3H6 alum be used alone and without the borax, whereas if the borax be used alone it does not zlarify the water, and its employment along with the alum is not for the purpose of clari- Fying thewater,but merely to modify the acrid 3aste of thealum in the water. As already observed, however, I do not use alum at all, for it will not clarify infusions or decoctions of tea, but, on the contrary, will make them much more turbid.
What I claim, and desire to secure by Lethers Patent, is-- I 1. Thehereiu-described method of clarifying aqueous infusions or decoctions of tea, so that they will remain clarified and bril iant when cold, which consists in dissolving the precipitated matter that causes the turbid appearance 5 of saidinfusions ordecoctionsby'adding b'orax a j to them until a faintly alkaline reaction is pro I duced, whereby the liquor is clarifiedbrilliantly, all substantially as set forth. a q 2. Theherein-dcscribedmethod of clarifying ho aqueous infusions or decoctions of tea, so that l}: H they will remain clarified and brilliant when cold, and when charged with carbonic acid or mixed with carlmnat water for the produc-l tion of an'elfervescentbeverage,which'consists1' 5 in first effecting the removal of the matter I which the carbonic acid would precipitate by f 1 adding to said infusions or decoctions trihy-ldrate of alumina in about the proportion specii fied, stirring or agitating the solution sov that 5 the alumina and said mattermay combine,and then removing this combination by filtration or decantation, and nextiu dissolving the matter that causes the turbid appearance of said infusions or decoctions, owing to its precipitation on their becoming cold, by adding borax to them until a faintly alk aline reaction is produced, whereby the liquor is clarified brilliantly, all substantially as set forth. In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.
SAMUEL OLELAND DAVIDSON. Witnesses:
FRANCIS A. MAITLAND,
Librarian, I/inen Hall, Belfast. CHARLES Was" 1 Porter, Lmen Hall, Belfast.